Psychopaths constitute less than 1% of the general population but over 20% of prison populations. They commit a disproportionate amount of crime and violence in society. Given that the economic burden of crime in the United States is estimated to be over $2.3 trillion per year, psychopaths likely constitute one of the most expensive mental health conditions known today. This volume chronicles the latest science of psychopathy and the various ways the condition intersects with the criminal justice system. From the modern techniques to assess the symptoms, to its utility in predicting violent recidivism, to the latest neuroscience youth and adults, and the most promising avenues for treatment, this volume captures the modern science of the condition and discusses ethical and legal issues surrounding psychopaths.